There may be at least 30 tribes, maybe as many as 100; I haven't done the research on this to confirm, but that's what it seems like to me. Meanwhile, according to PeakD, there are 1,000s or 10,000s of communities.
Usually tribes with their own front-ends havve their own tokens. That's not always the case. Also, there are front-ends like Terrive which don't have a Layer 2 token. (Technically D.Buzz has a 20 million BUZZ max supply, but 0 are circulating.)
Usually when I discover new front ends there's a statement indicating that tribe members posting content earn greater rewards from using the tribal-front end. Now I know why. Whenever possible (since technical difficulties happen), match your front-end with your activity.
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